Simple indicator build ( colour changing the gap between moving averages)

Ok so i want to be able to have the gap between moving averages change colour.  

OR CAN BE FILLED LIKE ichimoku 

So basically would like 3 moving averages, 50EMA,200 EMA, 400 EMA ( can change these emas in inputs)

when 50 is above 200 the gap between the 50 and 200 fills with the colour green --( can also be changed in inputs)

when 50 is below 200 the gap between the 50 and 200 fills with the colour red ---( can be changed in inputs)

Ok when the 200 is above the 400 ema the gap between them is filled green

when the 200 is below the 400 the gap between the two moving averages fills with red.

When price changes from one colour to another I would like a simple alert saying " Trend Change" and beeps.

the second alert I would like is when price closes into one of these gaps between the moving averages

inputs

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Movingavgtype=EMA

moving-average-1=50

moving-average-2=200

moving-average-3=400

alert-trend-change=true or false

alert-price-close-in-gap= true or false